These days it's easy to simply buy an index fund, and your returns should (roughly) match the market. But in our experience, buying the right stocks can give your wealth a significant boost. For example, the Repligen Corporation (NASDAQ:RGEN) share price is 93% higher than it was five years ago, which is more than the market average. Zooming in, the stock is actually down 10.0% in the last year.

Since it's been a strong week for Repligen shareholders, let's have a look at trend of the longer term fundamentals.

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

Over half a decade, Repligen managed to grow its earnings per share at 14% a year. We do note that extraordinary items have impacted its earnings history. That makes the EPS growth particularly close to the yearly share price growth of 14%. Therefore one could conclude that sentiment towards the shares hasn't morphed very much. In fact, the share price seems to largely reflect the EPS growth.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

We consider it positive that insiders have made significant purchases in the last year. Even so, future earnings will be far more important to whether current shareholders make money. Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here..

A Different Perspective

While the broader market gained around 35% in the last year, Repligen shareholders lost 10.0%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Longer term investors wouldn't be so upset, since they would have made 14%, each year, over five years. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. It's always interesting to track share price performance over the longer term. But to understand Repligen better, we need to consider many other factors. Take risks, for example - Repligen has 1 warning sign we think you should be aware of.

Repligen is not the only stock that insiders are buying. For those who like to find lesser know companies this free list of growing companies with recent insider purchasing, could be just the ticket.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.